<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>停止计时器</title>
</head>
<body>
    <button>stop</button>
    <script>
        var btn = document.querySelector('button')
        var times = setTimeout(function(){
            console.log('qwewq');
        },300)
        btn.addEventListener('click',function(){
            clearTimeout(times)
        })
    </script>
</body>
</html>